Configuring Basic OSPF Verifying OSPF Adjacencies Verifying the
OSPF Database
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OSPF Prerequisites
IP routing must be enabled I.e. ip routing
Must be an up/up interface running IP Used for OSPF
Router-ID
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Enabling OSPF
Enable global OSPF process router ospf [process-id]
Process-id locally significant Exception is MPLS L3VPN
Enable interface OSPF process Process level
network [address] [wildcard] area [area-id] Interface level
ip ospf [process-id] area [area-id]
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OSPF Network Statement
Useful for enabling OSPF on multiple interfaces Wildcard mask
does not relate to subnet mask
Most specific match determines the area network 0.0.0.0
255.255.255.255 area 0 network 1.0.0.0 0.255.255.255 area 1 network
1.2.0.0 0.0.255.255 area 2 network 1.2.3.0 0.0.0.255 area 3 network
1.2.3.4 0.0.0.0 area 4
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OSPF Interface Statement
Enables OSPF on the primary and secondary IP addresses Secondary
advertisement can be disabled
OSPF stays enabled even if IP address changes
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OSPF Verification
Verify OSPF is enabled show ip ospf show ip ospf interface
[brief]
Verify OSPF adjacencies show ip ospf neighbor debug ip ospf
adj
Verify OSPF database show ip ospf database [router | network |
summary | ]
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Q&A
OSPF Single Area ConfigurationIn This SectionOSPF
PrerequisitesEnabling OSPFOSPF Network StatementOSPF Interface
StatementOSPF VerificationQ&A
